linux-kernel - RE: [kvm-ia64-devel] [PATCH] ia64 kvm fixes for O=... builds

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Message-ID: <42DFA526FC41B1429CE7279EF83C6BDC011CAECD@pdsmsx415.ccr.corp.intel.com>
Date:	Sun, 4 May 2008 09:01:54 +0800
From:	"Zhang, Xiantao" <xiantao.zhang@...el.com>
To:	"Al Viro" <viro@...IV.linux.org.uk>
Cc:	"Al Viro" <viro@....linux.org.uk>, <torvalds@...ux-foundation.org>,
	<sfr@...b.auug.org.au>, <linux-kernel@...r.kernel.org>,
	<kvm-ia64-devel@...ts.sourceforge.net>
Subject: RE: [kvm-ia64-devel] [PATCH] ia64 kvm fixes for O=... builds

Hi, Airo
    Currenlty,  We only allow CONFIG_KVM_INTEL = m , since it needs to
be relocated at insertion time. 
Xiantao
Al Viro wrote:
> On Mon, Apr 28, 2008 at 03:14:02PM +0100, Al Viro wrote:
>> On Mon, Apr 28, 2008 at 09:46:44PM +0800, Zhang, Xiantao wrote:
>>>>  kvm-intel-objs = vmm.o vmm_ivt.o trampoline.o vcpu.o optvfault.o 
>>>>  mmio.o \ vtlb.o process.o #Add link memcpy and memset to avoid
>>>> possible structure assignment error -kvm-intel-objs += memset.o
>>>> memcpy.o +kvm-intel-objs += ../lib/memset.o ../lib/memcpy.o
>>>>  obj-$(CONFIG_KVM_INTEL) += kvm-intel.o
>>> 
>>> I don't think it is workable for kvm-ia64.  Currently,  kvm-intel
>>> module needs to be relocated at insertion time, so the code is
>>> position-indenpent. Howerver, lib/*.memset.o(memcoy.o) are not
>>> compiled as position independent code, they can't be linked into
>>> the module correctly in your way. That is why we use symbol link
>>> instead of linking the objects under /lib.
>> 
>> symlinks won't work as you use them.  If you really need separately
>> compiled, use file with a couple of #include "../lib/......S" and
>> be done with that.
> 
> ... like this, perhaps?  I still wonder what will happen with either
> this or the original tree if you make CONFIG_KVM_INTEL=y, though -
> won't either variant give you duplicate symbols?
> 
> diff --git a/arch/ia64/kvm/Makefile b/arch/ia64/kvm/Makefile
> index 5235339..e7b9432 100644
> --- a/arch/ia64/kvm/Makefile
> +++ b/arch/ia64/kvm/Makefile
> @@ -54,5 +54,5 @@ EXTRA_CFLAGS_vcpu.o += -mfixed-range=f2-f5,f12-f127
>  kvm-intel-objs = vmm.o vmm_ivt.o trampoline.o vcpu.o optvfault.o
>  	mmio.o \ vtlb.o process.o
>  #Add link memcpy and memset to avoid possible structure assignment
> error -kvm-intel-objs += ../lib/memset.o ../lib/memcpy.o
> +kvm-intel-objs += memset.o memcpy.o
>  obj-$(CONFIG_KVM_INTEL) += kvm-intel.o
> diff --git a/arch/ia64/kvm/memcpy.S b/arch/ia64/kvm/memcpy.S
> new file mode 100644
> index 0000000..c04cdbe
> --- /dev/null
> +++ b/arch/ia64/kvm/memcpy.S
> @@ -0,0 +1 @@
> +#include "../lib/memcpy.S"
> diff --git a/arch/ia64/kvm/memset.S b/arch/ia64/kvm/memset.S
> new file mode 100644
> index 0000000..83c3066
> --- /dev/null
> +++ b/arch/ia64/kvm/memset.S
> @@ -0,0 +1 @@
> +#include "../lib/memset.S"

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